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RS8V435M-FB vs RS8V420M-FB 16 of 19 identical Swap Change panels

Resun Solar RS8V435M-FB vs Resun Solar RS8V420M-FB

Resun Solar
RS8V435M-FB
435 Wp 22.28 % TOPCon
Open panel page Datasheet PDF
VS
Resun Solar
RS8V420M-FB
420 Wp 21.51 % TOPCon
Open panel page Datasheet PDF
The verdict

RS8V435M-FB leads on the differences that matter

The largest is module efficiency: 0.77 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter RS8V435M-FB RS8V420M-FB Difference
Module efficiency 22.28 % 21.51 % 0.77 pp more efficient
Power density 222.8 Wp/m² 215.1 Wp/m² 7.7 Wp/m² higher
Rated power 435 Wp 420 Wp 15 W more power
02

What it means on a roof

Thirty years of production
Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
RS8V435M-FB
14,368 kWh
RS8V420M-FB
13,873 kWh
Lifetime gap
495 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario RS8V435M-FB RS8V420M-FB
Standard test conditions 25 °C 100.0% of rated power 435 W 420 W
Cool, bright day 40 °C 94.8% of rated power 412 W 398 W
Typical summer roof 55 °C 89.5% of rated power 389 W 376 W
Hot roof 70 °C 84.2% of rated power 366 W 354 W
03

Full specification

Parameter RS8V435M-FB RS8V420M-FB Difference
Power and efficiency
Rated power 435 Wp 420 Wp +15 W for RS8V435M-FB
Module efficiency 22.28 % 21.51 % +0.77 pp for RS8V435M-FB
Power density 222.8 Wp/m² 215.1 Wp/m² +7.7 Wp/m² for RS8V435M-FB
Open-circuit voltage 37.97 V 37.58 V Effectively the same
Voltage at max power 32.25 V 31.78 V Effectively the same
Short-circuit current 14.35 A 14.11 A Effectively the same
Current at max power 13.49 A 13.22 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 1722x1134x30 mm 1722x1134x30 mm Same
Module area 1.953 m² 1.953 m² Same
Weight 21.5 kg 21.5 kg Same
Weight per kWp 49.4 kg/kWp 51.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.50 %/yr 0.50 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 108 108 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#5,403 vs #7,894
RS8V435M-FB leads by 2,491 places
Power density
#5,150 vs #7,882
RS8V435M-FB leads by 2,732 places
Heat behaviour
#10,419 vs #10,419
Tied - the same position in the database
Weight
#2,936 vs #4,567
RS8V435M-FB leads by 1,631 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,138 vs #10,194
RS8V435M-FB leads by 1,056 places
05

More useful comparisons

Open the full database
Same series, other bin
Resun Solar
Resun Solar RS8V435M-FB vs Resun Solar RS8V430M-FB
One difference: module efficiency
Same series, other bin
Resun Solar
Resun Solar RS8V435M-FB vs Resun Solar RS8V425M-FB
3 differences, the largest is module efficiency
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Resun Solar
Resun Solar RS8V435M-FB vs Resun Solar RS9H-M TOPCON-735
13 differences, the largest is module efficiency
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Resun Solar
Resun Solar RS8V435M-FB vs Resun Solar RS9H-M TOPCON-730
13 differences, the largest is module efficiency
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Resun Solar
Resun Solar RS8V435M-FB vs Resun Solar RS9H-M TOPCON-725
13 differences, the largest is module efficiency
Same manufacturer
Resun Solar
Resun Solar RS8V435M-FB vs Resun Solar RS9H-M TOPCON-720
13 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Resun Solar RS8V435M-FB or Resun Solar RS8V420M-FB?
According to our database: Resun Solar RS8V435M-FB has higher module efficiency (22.28% vs 21.51%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Resun Solar RS8V435M-FB and Resun Solar RS8V420M-FB?
Resun Solar RS8V435M-FB has a module efficiency of 22.28%, while Resun Solar RS8V420M-FB is 21.51%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Resun Solar RS8V435M-FB use vs Resun Solar RS8V420M-FB?
Resun Solar RS8V435M-FB uses TOPCon cells; Resun Solar RS8V420M-FB uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Resun Solar RS8V435M-FB and Resun Solar RS8V420M-FB?
Resun Solar RS8V435M-FB has a 30 years power warranty; Resun Solar RS8V420M-FB has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.

Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.